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Frankfurter

Free#39 of 100 in Currency Converter Apps

Frankfurter: An open, free API for developers who need historical and daily currency rates. Ranked #39 of 100 in Currency Converter Apps by our editors (4.9/10); pricing: Free plan; best for developers needing an open exchange-rate API.

4.9/10Editor score

Visit Frankfurter

Frankfurter4.9 Visit Frankfurter

At a glance

Editor score
4.9 / 10
Pricing
Free plan
Best for
Developers needing an open exchange-rate API
Free plan
Yes
Paid from
Free
Currencies supported
223 currencies
Facts checked
20 Oct 2026

Where it wins
- 223 currencies with daily data from central banks and official sources
- Historical rates and time-series queries dating back to 1948
- REST access without an API key plus Docker self-hosting
Where it doesn't
- Daily refresh may not fit applications needing intraday rates
- API-oriented design is not a consumer mobile converter
- Private deployment requires Docker-based self-hosting

Our verdict on Frankfurter

Frankfurter is an open-source exchange-rates API for developers building currency features into software, spreadsheets, data workflows, or internal tools. It provides daily foreign-exchange data from central banks and other official sources, with support for 223 currencies. The public REST API is free, requires no API key, and can also be deployed privately with Docker. Its audience is technical teams and individuals who need programmable rates rather than a consumer-focused mobile conversion experience.

The free service combines current rates with historical lookups and time-series queries reaching back to 1948. Provider-specific rate queries, provider attribution, currency and provider directory endpoints, and CSV or NDJSON responses give developers control over how rate data is retrieved and represented. Integrations for Excel, Google Sheets, JavaScript, MCP, pandas, and Python extend the same data into common development and analysis environments. For organizations that need more control over deployment, the self-hosted option provides a private Docker instance while preserving the API model.

Frankfurter’s main constraint is its daily refresh schedule, which may not suit applications requiring intraday or real-time market movements. Its API-first design also means teams seeking a ready-made consumer converter will need to build their own interface or choose a dedicated app instead. Developers who value open-source access, long historical coverage, official-source data, and flexible output formats should find a strong fit here; teams prioritizing frequent updates or a polished end-user mobile experience should look elsewhere.

Your product? Our editors can test Frankfurter in depth and publish a review, labelled as paid · from $149/mo →

Frankfurter pricing

Plans Free planFree Free to use — no paid tier required for the core job.

See plans on frankfurter.dev

Frankfurter fact sheet

Free plan	Yes
Paid from	Free
Currencies supported	223 currencies
Rate refresh frequency	Daily
Offline mode	Not verified
Rate alerts	Not verified
Historical rate charts	Yes
Available platforms	Web
Deployment	Cloud, Self-hosted
Platforms	Web
Support	Community, Docs
Built for	Solo, Small business, Mid-market, Enterprise (editorial estimate)
Integrations	6 integrations: Excel, Google Sheets, JavaScript, MCP, pandas, Python See all →
Pricing	Free plan
Website	frankfurter.dev
Facts checked	20 Oct 2026

Frankfurter integrations

Frankfurter lists 6 integrations on its own site.

Excel
Google Sheets
JavaScript
MCP
pandas
Python

See all Frankfurter integrations →

Alternatives to Frankfurter

See all Frankfurter alternatives →

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Featured on iTechGuides

Frankfurter is listed in our Currency Converter Apps directory. Add the badge to your site — it links back to this page.

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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

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Last updated 31 Oct 2026 · How we research and update